... Size: M6*15, M6*20 Product name: machine screwRelated Products: wood screw, chipboard screw, ball ... nuts, self drilling screw, self tapping screw, machine screw, furniture screwdrywall screw, screw nut, screw ... 2) Main equipment: CNC machine, automatic lathe, grinder, thread rolling machine, tapping /drilling machine etc 3) Measuring & testing ... Russia, Brazil, Iran and Singapore etc Tank bolt screw